Universal

Motion: Lateral offset (large) in any direction

Least expensive for application. As with the single expansion joint, lack of control devices demands careful anchoring and guidance of connected piping. Suitable for low pressure applications only.

Universal Tied

Motion: Lateral offset (large) in any direction

Like the simple (non-tied) Universal expansion joint, the Tied Universal accommodates large lateral offset by virtue of small angular rotations. Tie rods are used to limit center spool motion and contain pressure thrust. This configuration can be used in systems which cannot provide optimum anchoring and guiding.

Pressured Balanced Elbow

Motion: Axial (plus limited lateral and angular)

Eliminates pressure thrust and requirement for main anchors. Minimizes guiding requirement. Frequently used at point of connection to equipment which is sensitive to nozzle loading.

Hinged

Motion: Angular rotation (single plane)

Maximizes bellows life by closely controlling movement and preventing torsion damage. Hinge structure contains pressure thrust, transmits extraneous loads and supports dead weight. Use of two or three hinged expansion joints separated by pipe spools in a system containing a 90° turn can accommodate large pipe excursions in a single plane.

Rectangular

Motion: Axial, lateral offset (limited) and angular rotation

Typically used in low pressure ducting. Rectangular shape with deep convolutions provides low spring rates but limits pressure capacity. Available in single or universal configurations, these expansion joints may be fitted with control devices such as rods or hinges to fit individual applications.